The Manual of the Botany of the Northern United States / Including the District East of the Mississippi and North of North Carolina and Tennessee

by Asa Gray

139. [Marchantiaceæ] ([p. 727]). Thallus radiate or dichotomous, the epidermis usually porose. Capsules borne on the under side of a pedunculate receptacle, irregularly dehiscent. Elaters 2-spiral.

140. [Ricciaceæ] ([p. 730]). Thallus radiate or dichotomous, the epidermis eporose. Capsules immersed in the thallus or sessile upon it, indehiscent. Elaters none.

ANALYTICAL KEY TO THE ORDERS.

Class I. DICOTYLEDONOUS PLANTS. (See p. 1.)

Subclass I. ANGIOSPERMÆ. Pistil consisting of a closed ovary. Cotyledons only two.

Division I. POLYPETALOUS: the calyx and corolla both present; the latter of separate petals.

A. Stamens numerous, at least more than 10, and more than twice the sepals or lobes of the calyx.

1. Calyx entirely free and separate from the pistil or pistils.

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